(USA TODAY) Friends and family of the late Oscar-winning actor Philip Seymour Hoffman gathered Friday to say a final goodbye to the actor, who was considered one of the premier talents of his generation.

Among guests at the private funeral held at St. Ignatius of Loyola church in Manhattan were famous faces Meryl Streep, Joaquin Phoenix, Michelle Williams, Ashley Olsen, Mary-Louise Parker, Spike Lee and Brian Dennehy.

The stars joined costume designer Mimi O'Donnell, Hoffman's longtime partner, and their three children - Cooper, 10, Tallulah 7, and Willa, 5 - and his mother, Marilyn O'Connor. O'Donnell and Hoffman were estranged, according to E! News, and were not living together when he died.

Hoffman, 46, was found dead in his Manhattan apartment Sunday morning after an apparent heroin overdose. Autopsy results were inconclusive, however, and medical examiners say more tests will need to be run to determine exactly what caused his death.

Stars from all over the acting community also paid their respects to Hoffman on Thursday evening at his wake.

Blanchett, Adams, Phoenix and other actors attended the somber event held at the nearby Frank E. Campbell funeral home in Manhattan on the eve of the funeral. A memorial is scheduled for later this month.

Other actors there to mourn Hoffman included Streep, Williams, Justin Theroux, Ben Stiller, Billy Crudup, Ellen Burstyn and Josh Hamilton. Screenwriter David Bar Katz, who found Hoffman's body Sunday, was also in attendance with his son.

Blanchett, who worked with Hoffman on 1999's The Talented Mr. Ripley, reportedly looked visibly shaken as she and husband Andrew Upton entered and later exited the building. The actress, whose Monuments Men hits theaters Friday, had been scheduled to appear on Good Morning America and Live! With Kelly and Michaelthis week to promote the film but canceled to mourn her friend.

Representatives for the Oscar-winning actress, who's nominated this year for Blue Jasmine, told The Hollywood Reporter the cancellations were "to allow Cate the time and privacy to grieve for the loss of her friend Philip Seymour Hoffman."